class RegExpConstant {
  RegExpConstant._();
  static final String userName = r"^[a-zA-Z0-9_-]{4,16}$";
  static final String password = r"^(?![0-9]+$)(?![a-z]+$)(?![A-Z]+$)(?!([^(0-9a-zA-Z)])+$).{6,20}$";
}
